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3999 Aristarchus (1989 AL)
Classification: Main-belt Asteroid          SPK-ID: 2003999
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1200171118979168 4.1188e-08  
a 2.459944509716678 7.269e-09 au
q 2.164709074231345 1.0265e-07 au
i 2.541884771896492 3.8784e-06 deg
node 296.6002491275102 7.4894e-05 deg
peri 210.0124210397958 7.6215e-05 deg
M 17.81904660003618 1.3094e-05 deg
tp 2458930.746122293362
(2020-Mar-22.24612229)
5.1291e-05 TDB
period 1409.24464355679
3.86
6.2464e-06
1.71e-08
d
yr
n .255456000238111 1.1323e-09 deg/d
Q 2.75517994520201 8.1414e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2788  
   data-arc span      28223 days (77.27 yr)  
   first obs. used      1943-03-07  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43874  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:04:12  

Additional Information
 Earth MOID = 1.177 au 
 Jupiter MOID = 2.2527 au 
 T_jup = 3.479 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.7   n/a MPO502191  
diameter diameter 18.275 km 0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 12.58 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Ditteon, R.; Kirkpatrick, E.; Doering, K. (2010) Minor Planet Bull. 37, 1-4.]
geometric albedo albedo 0.041   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3999 Aristarchus (1989 AL)          Discovered 1989-Jan-05 by Kojima, T. at Chiyoda
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1989 AL = 1943 EW = 1951 GD1 = 1970 DA = 1972 TJ1 = 1974 EH = 1975 NA1 = 1976 UQ4 = 1979 QC7 = 1980 XF1 = 1984 YH3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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